I've just returned my latest order of Spry gum due to the fact that XClear have unfortunately started adding titanium dioxide to it. This is a whitening agent with at best uncertain health effects. Quite a disappointing decision from the manufacturer - the lack of titanium dioxide in the original formulation was one of the key factors in my using it in the first place. Given how frequently one consumes gum like this I personally don't want any dubious additives in it. Switching to Peelu.

This is actually cheaper then the stuff you get with aspartam, gelatin and so on. And it is actually good for your teeth! The taste is normal, and lasts for quite some time.
I make sure to order a can on a regular basis when the USD is low compared to the NOK, cause this product has a tendency to be just around the import limit for Norway.